Author:
Gottschall M.,Afzal F.,Anisovich A. V.,Bayadilov D.,Beck R.,Bichow M.,Brinkmann K. Th.,Crede V.,Dieterle M.,Dietz F.,Dutz H.,Eberhardt H.,Elsner D.,Ewald R.,Fornet-Ponse K.,Friedrich St.,Frommberger F.,Gridnev A.,Grüner M.,Gutz E.,Hammann Ch.,Hannappel J.,Hartmann J.,Hillert W.,Hoffmeister Ph.,Honisch Ch.,Jude T.,Kammer S.,Kalinowsky H.,Keshelashvili I.,Klassen P.,Klein F.,Klempt E.,Koop K.,Krusche B.,Kube M.,Lang M.,Lopatin I.,Mahlberg P.,Makonyi K.,Metag V.,Meyer W.,Müller J.,Müllers J.,Nanova M.,Nikonov V.,Novotny R.,Piontek D.,Reicherz G.,Rostomyan T.,Sarantsev A.,Schmidt Ch.,Schmieden H.,Seifen T.,Sokhoyan V.,Spieker K.,Thiel A.,Thoma U.,Urban M.,Pee H. van,Walther D.,Wendel Ch.,Werthmüller D.,Wiedner U.,Wilson A.,Winnebeck A.,Witthauer L.,Wunderlich Y.
Abstract
AbstractA measurement of the double-polarization observable E for the reaction $$\gamma p\rightarrow \pi ^0 p$$
γ
p
→
π
0
p
is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bonn using the Bonn frozen-spin butanol (C$$_4$$
4
H$$_9$$
9
OH) target, which provided longitudinally-polarized protons. Circularly-polarized photons were produced via bremsstrahlung of longitudinally-polarized electrons. The data cover the photon energy range from $$E_\gamma =600$$
E
γ
=
600
to 2310 MeV and nearly the complete angular range. The results are compared to and have been included in recent partial wave analyses.
Funder
Office of Science
Deutsche Forschungsgemeinschaft
Russian Foundation for Basic Research
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics